Why you dont use unhonorific suddenly. unhonorific is 반말。말，as we all know，it means sentence.반 is Chinese word related to 半（half）.So 반말 means 半語.At there，it refers to unhonorific which means the words that is disrespect.In Japanese and Korean，there are very important parts in language which is ending auxiliary，I guess that the sentence you related to have disrespect ending auxiliary.

I know it thank you